New research suggests a dramatic link between a 14th-century volcanic eruption and the onset of the Black Death,one of historyS deadliest pandemics. Scientists have long sought to understand the precise origins of the plague, which killed an estimated 30-50% of Europe’s population, and this study points to a chain of events triggered by a major eruption around 1345. The findings underscore the critical, and often overlooked, relationship between global climate events, agricultural stability, and the emergence of infectious diseases-a connection with stark relevance in today’s world.
San Francisco —
A devastating pandemic that reshaped Europe centuries ago may have had its origins in a massive volcanic eruption, according to new research. The Black Death, which wiped out an estimated one-third to one-half of Europe’s population in the mid-14th century, has long been a subject of historical inquiry, but the initial trigger for the pandemic remained elusive.
Scientists at Cambridge University and in Germany have reconstructed a timeline of events, combining environmental clues with historical records, to pinpoint a potential catalyst. This research highlights the interconnectedness of climate, agriculture, and public health – a connection increasingly relevant in the face of modern global challenges.
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The team identified particles of soot trapped deep within ice cores from Antarctica and Greenland, indicating at least one large volcanic eruption in the tropics around 1345. This eruption would have blanketed the Earth in a thick haze of ash and sulfur.
These findings align with contemporary written accounts describing unusual cloud formations and darkened lunar eclipses, as detailed in a study published in the journal Communications Earth & Environment.
Further analysis of tree rings from the period revealed stunted growth over a three-year span. Researchers at Cambridge believe this indicates that the volcanic haze led to colder, wetter conditions and a series of crop failures.
“The volcanic eruption had a significant impact on food supplies, which was a crucial early stage in the chain of events that triggered the pandemic,” said Dr. Martin Bauch, a co-author of the study from the Leibniz Institute for the History and Culture of Eastern Europe. “In the years leading up to the Black Death, there was very unusual weather across England, the Mediterranean, and the Levant.”
“These large-scale patterns can only be explained by climatic factors, and volcanoes are a plausible explanation because their impact can last for two or three years. Everything is interconnected,” he added.
The subsequent famine, researchers say, explains why Italian port cities like Venice, Genoa, and Pisa began trading with the Mongol Empire in 1347, importing grain to bolster food supplies.
Previous research suggests that ships carrying this grain also transported fleas infected with the bacterium Yersinia pestis, likely originating in Central Asia. Upon arrival in Italy, the fleas transferred to rodents and other mammals, spreading the plague across Europe.
“These powerful Italian city-states had established long-distance trade routes across the Mediterranean and Black Seas, allowing them to activate highly efficient systems to prevent famine. However, this inadvertently triggered a far greater disaster,” Dr. Bauch explained.
Professor Ulf Buentgen from the University of Cambridge’s Department of Geography, another author of the study, described the “perfect storm” of climatic, agricultural, social, and economic factors that fueled the Black Death as an early example of the consequences of globalization.
“While the confluence of factors contributing to the Black Death appears rare, the probability of zoonotic diseases emerging due to climate change and turning into pandemics is likely to increase in a globalized world. This is highly relevant given our recent experience with Covid-19,” he stated.
